I havn't really heard of rules before. >.>
Decora is mismatchy, lots of colorful pins in your hair. hard to make
rules for a fashion like that in my opinion. XD
and i have seen black and green color scheme decora in my Kera magazine.
If i had a scanner i would have shown you. ><

if you havnt you should join this facebook page lots of pictures and other Decora lovers. ^^